Determination of 7 pyrethroid residues in pepper by gas chromatography

The residue determination method of seven pyrethroids (fenpropathrin,lambda-cyhalothrin,permethrin,cyfluthrin,cypermethrin,fenvalerate,deltamethrin) in pepper was established and simplified by using gas chromatography (GC-μECD) analysis.Samples were extracted with 50 mL V(acetonitrile):V(water)=3:1,the extracting solution was purified with dichloromethane and N-(n-propyl)ethylenediamine(cleanert PSA),separated by using HP-1 capillary column and determined by using the gas chromatography-electron capture device.The average recovery was 74.0%-105.6% and the relative standard deviation was 3.3%-15% at spiked level of 0.017-0.64 mg/kg.The result showed that the method was accurate and sensitive.It could determine seven pyrethroid residues in peppers simultaneously.